How to pull up port A in 16F819 by program?

sorasit46 · Joined: 07 May 2007 Posts: 69

16F819
port_b_pullups(TRUE);
How to program pull up port A ?

thanks

temtronic · Posted: Wed Dec 29, 2010 7:12 pm

You have easy two options that I can quickly think of.

Use external resistors of the appropriate value for your particular application and PIC,be sure to read the datasheet for correct inforamtion

or

Read the datasheet, hint, I/O PORTS section, PORTA, first chapter. In there is a wealth of specific information on the subject.

After over 50 years of building 'stuff' and inhaling solder fumes I've always found that reading the manual is the FIRST thing you should do when 'playing with chips'.

scottc · Joined: 16 Aug 2010 Posts: 95

You can't in software

Page 39 of the data sheet,

http://ww1.microchip.com/downloads/en/DeviceDoc/39598e.pdf

There are no weak pullups for port a.

Weak Pullups do exist for Port B.

If you need to pull the pin up then you will have to use an external
resistor to VCC, a value of 47K should be ok.

Scott

sorasit46 · Joined: 07 May 2007 Posts: 69

Thanks and happy new year.